1572275491 has 2 divisors, whose sum is σ = 1572275492. Its totient is φ = 1572275490.

The previous prime is 1572275489. The next prime is 1572275527. The reversal of 1572275491 is 1945722751.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1572275491 - 2¹ = 1572275489 is a prime.

It is a super-4 number, since 4×1572275491⁴ (a number of 38 digits) contains 4444 as substring.

Together with 1572275489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1572275461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 786137745 + 786137746.

It is an arithmetic number, because the mean of its divisors is an integer number (786137746).

Almost surely, 2^1572275491 is an apocalyptic number.

1572275491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1572275491 is an equidigital number, since it uses as much as digits as its factorization.

1572275491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 43.

The square root of 1572275491 is about 39651.9292216659. The cubic root of 1572275491 is about 1162.8121157696.

The spelling of 1572275491 in words is "one billion, five hundred seventy-two million, two hundred seventy-five thousand, four hundred ninety-one".